You can search for identifiers within the package.
in-package search v0.2.0
exception Replace_phrase of int * string
val index_of_substring_from : string -> int -> string -> int
val rindex_of_substring_from : string -> int -> string -> int
val index_of_substring : string -> string -> int
val rindex_of_substring : string -> string -> int
val contains_substring : string -> string -> bool
val contains_substring_from : string -> int -> string -> bool
val rcontains_substring_from : string -> int -> string -> bool
val indexlist_of_substring : string -> string -> int list
val rev_concat : string -> string list -> string
val replace_char : string -> (char -> int -> string) -> string
val replace_substring : string -> string list -> (string -> int -> string) -> string